Fe-25Cr ferritic alloy was oxidized at 1073 K under the electric current flow, 0.50 Acm(-2), with exposing anode and cathode atmospheres simulating the operating condition of SOFC. The morphology of scale is almost same between with current and without current. The oxide scales are composed of Cr2O3 and small amount of MnCr2O4 spinel which dispersed on the surface of the scale. The thickness of scale at anode side with current is thicker than that without current and that at cathode side with current is thinner than that without current. The scale thickness with electric current could be represented by the formula based on Wagner's theory for high temperature oxidation. And the formula derives the transference number of Cr ion, t(Cr) in Cr2O3 scale was obtained as 1.8 x 10(-6). (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.036203jes] All rights reserved.